“to investigate / to adjust” in Japanese is 調, read chou, shira, totono (ちょう, しら, ととの). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 調査 (survey).
What does 調 mean?
言葉を調べる。
Same sound, different character — the classic trap. Compare them side by side: